diff --git a/crypto/constant_time_locl.h b/crypto/constant_time_locl.h
index c048393..7b339a7 100644
--- a/crypto/constant_time_locl.h
+++ b/crypto/constant_time_locl.h
@@ -204,7 +204,7 @@
 	return (unsigned char)(constant_time_select(mask, a, b));
 	}
 
-inline int constant_time_select_int(unsigned int mask, int a, int b)
+static inline int constant_time_select_int(unsigned int mask, int a, int b)
 	{
 	return (int)(constant_time_select(mask, (unsigned)(a), (unsigned)(b)));
 	}